化工进展 ›› 2019, Vol. 38 ›› Issue (9): 4352-4360.DOI: 10.16085/j.issn.1000-6613.2019-0106

• 资源与环境化工 • 上一篇    

微波辅助离子液体EmimOAc提取毛竹木质素

胡莉芳1,3,何鸿伟1,3,张宇1,3,夏琪1,3,袁林1,2,彭红1,3(),阮榕生1,3,周梦阳1,3   

  1. 1. 南昌大学生物质转化教育部工程研究中心,江西 南昌 330047
    2. 南昌大学材料科学与工程学院,江西 南昌 330047
    3. 南昌大学食品科学与技术国家重点实验室,江西 南昌 330047
  • 收稿日期:2019-01-15 出版日期:2019-09-05 发布日期:2019-09-05
  • 通讯作者: 彭红
  • 作者简介:胡莉芳(1993—),女,硕士研究生。
  • 基金资助:
    国家自然科学基金(21666022);江西省教育厅科学技术研究项目(GJJ150189)

Microwave-assisted extraction of lignin from bamboo by ionic liquid EmimOAc

Lifang HU1,3,Hongwei HE1,3,Yu ZHANG1,3,Qi XIA1,3,Lin YUAN1,2,Hong PENG1,3(),Rongsheng RUAN1,3,Mengyang ZHOU1,3   

  1. 1. Engineering Research Center of Biomass Conversion, Ministry of Education, Nanchang University, Nanchang 330047, Jiangxi, China
    2. School of Materials Science and Engineering, Nanchang University, Nanchang 330047, Jiangxi, China
    3. State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, Jiangxi, China
  • Received:2019-01-15 Online:2019-09-05 Published:2019-09-05
  • Contact: Hong PENG

摘要:

毛竹细胞壁强的抗解构特性大大限制了毛竹作为原料在生物质能源、生物质基材料等领域的应用,因此有必要对其进行包括主要组分分离在内的预处理以提高它的使用效率。本研究采用微波辅助1-乙基-3-甲基咪唑乙酸盐(EmimOAc)法从毛竹中分离出木质素,分析所获得的木质素的物理化学特性,并与用5% NaOH(50℃,5h)提取的毛竹木质素、油浴加热(110℃,16h)EmimOAc提取的毛竹木质素进行对比。结果表明:微波辅助EmimOAc处理80min后木质素得率14.7%,比油浴加热EmimOAc提取木质素的得率(6.2%)提高了2倍以上;离子液体提取的木质素(ILL)和碱提木质素(AL)具有相似骨架结构,但在离子液体的作用下,ILL结构中有更多的酯键链接发生断裂;与AL相比,ILL具有更高的热稳定性。

关键词: 毛竹, 木质素, 微波辅助提取, 离子液体, 化学结构

Abstract:

The strong anti-deconstructive property of the bamboo (Phyllostachys pubescens Mazel) cell wall greatly limits its utilization as raw material in the fields of bioenergy, biomass-based materials, etc. Therefore, it is necessary to carry out pretreatment including main component separation to improve its utilization efficiency. In this work, microwave-assisted extraction of lignin from bamboo by using 1-ethyl-3-methylimidazolium acetate (EmimOAc) as solvent was carried out. The physicochemical properties of the obtained lignin fractions were characterized, and compared with the lignin extracted by EmimOAc using oil bath as heating source (110℃, 16h) and the alkali-soluble lignin extracted by 5% NaOH solution (50℃, 5h). The results showed that the yield of lignin when EmimOAc was used as extractant under the microwave irradiation could reach 14.7% within 80min, which was more than twice of the yield (6.2%) when the lignin was extracted by EmimOAc using oil bath as heating source. Ionic liquid extracted lignin (ILL) and alkaline extracted lignin (AL) had a similar backbone structure, but under the effect of ionic liquid, more ester bonds between the ILL structural units were broken. Compared with AL, ILL showed higher thermal stability.

Key words: bamboo, lignin, microwave-assisted extraction, ionic liquid, chemical structure

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